PIC24F32KA302-ISLASHML datasheet(136/364 Pages) MICROCHIP

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PIC24FV32KA304 FAMILY

DS39995D-page 136

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11.1.1

OPEN-DRAIN CONFIGURATION

In addition to the PORT, LAT and TRIS registers for

data control, each port pin can also be individually

configured for either digital or open-drain output. This is

controlled by the Open-Drain Control register, ODCx,

associated with each port. Setting any of the bits

configures the corresponding pin to act as an

open-drain output.

The maximum open-drain voltage allowed is the same

as the maximum VIH specification.

11.2

Configuring Analog Port Pins

The use of the ANS and TRIS registers control the

operation of the A/D port pins. The port pins that are

desired as analog inputs must have their correspond-

ing TRISx bit set (input). If the TRISx bit is cleared

(output), the digital output level (VOH or VOL) will be

converted.

When reading the PORT register, all pins configured as

analog input channels will read as cleared (a low level).

Analog levels on any pin that is defined as a digital

input (including the ANx pins) may cause the input

buffer to consume current that exceeds the device

specifications.

11.2.1

ANALOG SELECTION REGISTERS

I/O pins with shared analog functionality, such as A/D

inputs and comparator inputs, must have their digital

inputs shut off when analog functionality is used. Note

that analog functionality includes an analog voltage

being applied to the pin externally.

To allow for analog control, the ANSx registers are

provided. There is one ANS register for each port

(ANSA, ANSB and ANSC). Within each ANSx register,

there is a bit for each pin that shares analog

functionality with the digital I/O functionality.

If a particular pin does not have an analog function, that

bit is unimplemented. See Register 11-1 to Register 11-3

for implementation.

ANSA: ANALOG SELECTION (PORTA)

U-0

—

bit 15

bit 8

U-0

R/W-1

—

ANSA3

ANSA2

ANSA1

ANSA0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-4

Unimplemented: Read as ‘0’

bit 3-0

ANSA<3:0>: Analog Select Control bits

1 = Digital input buffer is not active (use for analog input)

0 = Digital input buffer is active

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